JP3766404B2 - Nozzle moving mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a nozzle moving mechanism. In the forging press, in order to improve the flow of billet and mold releasability in the mold, the lubricant is sprayed from the nozzle to the mold surface while the pair of upper and lower molds are separated. This nozzle moves closer to and away from the mold in conjunction with the vertical movement of the upper mold, that is, the vertical movement of the slider, and is arranged between the pair of upper and lower molds when the slider rises, that is, when the upper mold moves away from the lower mold. When the slider is lowered, it is adjusted so as to retract from the pair of upper and lower molds.
The present invention relates to a nozzle moving mechanism that can move the nozzles closer to and away from each other.
[0002]
[Prior art]
As a moving device for moving the nozzle close and close, there is a technique shown in Conventional Example 1 (Patent Document 1).
The moving device of the conventional example 1 is configured such that a moving lever with a nozzle attached is swung between a pair of parallel levers pivotally attached to the moving lever, so that the nozzle is kept horizontal, while the nozzle is kept horizontal. That is, the nozzle is moved close and separated by a parallel link.
The swing of the pair of levers of this moving device is arranged so as to be in contact with one of the pair of levers, and by the rotation of a cam connected to the drive shaft of a transfer feeder that supplies and discharges the material to and from the forging press. Done. For this reason, since the nozzle can be moved closer to and away from the operation timing of the transfer feeder, in other words, in synchronization with the operation timing of the slider of the forging press, the interference between the nozzle and the mold can be reliably prevented.
Moreover, since the nozzle is located at a substantially fixed position while the slider is stopped at the top dead center, the lubricant is surely sprayed onto the mold while the slider is stopped at the top dead center. Can do. Therefore, the time for spraying the lubricant from the nozzle to the mold can be increased, and a predetermined amount of lubricant can be sprayed to the mold.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 06-344054
[Problems to be solved by the invention]
However, since the movement device of Conventional Example 1 has the movement of the nozzle fixed to the operation of the slider of the forging press, the movement of the nozzle has no degree of freedom. For this reason, if the stop position of the top dead center of the forging press varies from cycle to cycle, the position at which the nozzle is disposed also varies. Then, even if a predetermined amount of lubricant is sprayed from the nozzle, depending on the position of the mold surface, there may be a place where the amount of lubricant sprayed is insufficient, and releasability due to poor lubrication may occur. There is a risk of deterioration.
On the other hand, if the structure is such that the nozzle is moved using a servo motor or the like, the movement of the nozzle can be freely controlled regardless of the movement of the slider, so that the forging press slider stops at the top dead center. Even if the position varies from cycle to cycle, the position where the nozzle is arranged can be kept constant. However, since the movement of the nozzle is not interlocked with the movement of the slider, the nozzle may interfere with a mold, a die holder or the like. In order to prevent the nozzle from interfering with the mold or the like, it is necessary to move the nozzle after confirming that the slider has stopped, and the spraying time of the lubricant is shortened by the time for the nozzle to approach and separate. Therefore, there is a risk of poor lubrication due to an insufficient amount of lubricant.
[0005]
In view of such circumstances, an object of the present invention is to provide a nozzle moving mechanism that can reliably prevent interference between a nozzle and a mold or the like and can keep the state of spraying a lubricant optimally.
[0006]
[Means for Solving the Problems]
In the forging press, the nozzle moving mechanism according to claim 1 is a mechanism that inserts and detaches a nozzle that sprays lubricant onto the upper and lower pair of mold surfaces between the upper and lower pair of molds, and the mechanism includes the nozzle , inserting a nozzle operating section having a nozzle forward and reverse part is moved along the nozzle in the axial direction, is connected to the slider, the nozzle firing unit before Symbol nozzles spraying position between the pair of upper and lower molds a swing arm forward position and the previous SL nozzle moves between a retracted position disengaged from between the pair of upper and lower molds to be, a stop detector for detecting the stop of the slider forging press, the slider stop The displacement amount detection unit for detecting the displacement amount from the top dead center of the stop position, and the relative displacement between the nozzle stop position and the spray position when the slider is stopped, Said displacement A correction amount calculation unit that calculates based on the amount of displacement detected by the detection unit, and the nozzle advancement / retraction unit moves the nozzle to the spray position by the amount of deviation calculated by the correction amount calculation unit. It is made to move toward .
The nozzle moving mechanism according to claim 2 is the invention according to claim 1, wherein the nozzle advancing / retreating portion is provided so as to be movable along the screw shaft provided parallel to the axial direction of the nozzle, It is a ball screw mechanism provided with a nut member to which the nozzle is attached and a rotating means for rotating the screw shaft around its central axis .
[ 0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory diagram of a state in which the nozzle operating unit 20 of the nozzle moving mechanism 10 of the present embodiment is disposed at the forward movement position. FIG. 2 is an explanatory diagram of a state in which the nozzle operating unit 20 of the nozzle moving mechanism 10 of the present embodiment is disposed at the retracted position. In FIGS. 1 and 2, symbol P indicates a forging press, symbols MA and MB indicate an upper die and a lower die, and symbol S indicates a forging press P that is moved up and down by rotation of a crankshaft (not shown). The slider is shown.
[0008]
The nozzle moving mechanism 10 of the present embodiment inserts and removes a nozzle 11 that sprays a lubricant on the surface of a pair of upper and lower molds MA and MB of the forging press P between the pair of upper and lower molds MA and MB. By providing the nozzle operating part 20, the position of the nozzle 11 in the axial direction can be adjusted.
[0009]
In FIG. 1 and FIG. 2, the code | symbol 11 has shown the nozzle. The nozzle 11 has a spraying part for spraying a lubricant at its tip, and its rear end is held by a support member 11b.
This support member 11b is supported by a nozzle actuating portion 20 described later so that the axial direction of the nozzle 11 is horizontal. The nozzle operating unit 20 is attached to a bracket PB provided on the forging press P via a swing arm 12. The swing arm 12 is composed of a pair of support arms 12a and 12b which are parallel to each other. The upper ends of the support arms 12a and 12b are connected to each other through the nozzle actuating portion 20, and the lower ends are connected to each other through the bracket PB. The upper ends of the support arms 12a and 12b are both rotatably attached to the nozzle actuating portion 20, and the lower ends thereof are both rotatably attached to the bracket PB. That is, a parallel link is formed by the nozzle operating portion 20, the support arms 12a and 12b, and the bracket PB. Here, the parallel link indicates a parallel crank mechanism in which the crank swings. In the present application, the bracket PB corresponds to a stationary node and the support arm 12a corresponds to a crank.
[0010]
The lower end of the connecting arm 15 is fixed to the support arm 12 a of the swing arm 12. A connecting member 16 is provided between the upper end of the connecting arm 15 and the slider S. The connecting member 16 has a base end rotatably attached to the slider S and a tip end rotatably attached to the upper end of the connecting arm 15. The connecting member 16 has a pair of molds MA whose distal end is outside the line connecting the base end and the lower end of the support arm 12a, that is, the line connecting the base end and the lower end of the support arm 12a. , MB so as to be located on the opposite side.
[0011]
Therefore, when the slider S of the forging press P is lowered, the connecting arm 15 is swung away from the pair of molds MA and MB via the connecting member 16 (clockwise in FIG. 1). The arm 12a also swings away from the pair of molds MA and MB. Then, since the nozzle operating unit 20 is moved to the right while descending, the nozzle 11 is detached from between the pair of molds MA and MB, and when the slider S is lowered to the bottom dead center, it is disposed in the retracted position ( Figure 2).
On the contrary, when the slider S is raised, the connecting arm 15 is swung so as to approach the pair of molds MA and MB via the connecting member 16 (counterclockwise in FIG. 2). 12a also swings so as to approach the pair of molds MA and MB. Then, since the nozzle operating unit 20 moves upward while moving upward, the nozzle 11 moves toward the pair of molds MA and MB, and when the slider S rises to the top dead center, it is disposed at the forward position. (FIG. 1).
[0012]
Therefore, according to the nozzle moving mechanism 10 of the present embodiment, the swing arm 12 is swung in conjunction with the vertical movement of the slider S, and the nozzle operating unit 20 is moved between the forward position and the reverse position. Can do. When the slider S stops at the top dead center, the nozzle operating unit 20 is disposed at the forward position, and the nozzle 11 is disposed at the spraying position between the pair of upper and lower molds MA and MB. The agent can be reliably sprayed on the surfaces of a pair of upper and lower molds MA and MB. Since the movement of the nozzle operating unit 20 is interlocked with the slider S, it is possible to prevent the nozzle 11 from interfering with the pair of upper and lower molds MA and MB.
Moreover, since the parallel link is formed by the pair of support arms 12a and 12b of the swing arm 12, the nozzle operating portion 20 for horizontally supporting the nozzle 11 and the bracket PB, the nozzle 11 keeps its axial direction horizontal. Therefore, the nozzle 11 does not interfere with the pair of upper and lower molds MA and MB even when the distance between the pair of upper and lower molds MA and MB is narrow. Can be securely arranged.
[0013]
If the nozzle 11 can be moved so as not to interfere with the pair of upper and lower molds MA and MB, a parallel link is not formed by the pair of support arms 12a and 12b, the support member 11b and the bracket PB of the swing arm 12. Alternatively, the swing arm 12 may be one.
[0014]
Next, the nozzle operating unit 20 will be described in detail.
As shown in FIGS. 1 and 2, the nozzle operating unit 20 includes a screw shaft 21 disposed in parallel with the axial direction of the nozzle 11, in other words, in parallel with the axial direction of the support member 11 b. The screw shaft 21 is provided to be rotatable around the shaft, and a main shaft of an AC servomotor 23 is connected to one end of the screw shaft 21.
A nut member 22 is screwed onto the screw shaft 21, and the screw shaft 21 and the nut member 22 constitute a ball screw mechanism. The support member 11b is attached to the nut member 22.
[0015]
For this reason, if the AC servo motor 23 is driven, the nut member 22 can be moved along the screw shaft 21. That is, since the nut member 22 can be moved along the axial direction of the nozzle 11, the nozzle 11 can be moved in the axial direction together with the nut member 22 via the support member 11b.
[0016]
When the ball screw mechanism is operated, the nozzle 11 is moved in the axial direction regardless of the movement of the slider S. Therefore, when the slider S starts to descend from the top dead center, that is, the nozzle operating unit 20 moves forward. Even if the movement is started from the position toward the retracted position, the nozzle 11 can be moved between the pair of upper and lower molds MA and MB by the ball screw mechanism. In other words, only the nozzle 11 can be positioned between the pair of upper and lower molds MA 1 and MB even when the nozzle operation unit 20 starts to move backward. For this reason, since the time for the nozzle 11 to be positioned between the pair of upper and lower molds MA, MB can be lengthened, the spraying time of the lubricant can be made much longer than that of a normal device, and more Effective lubrication is possible.
[0017]
Further, since the nozzle 11 can be moved in the axial direction regardless of the movement of the slider S by the ball screw mechanism, the length of the upper mold MA in the front-rear direction (the length in the left-right direction in FIGS. 1 and 2) is long. In this case, after the slider S is raised, the nozzle 11 is moved between the pair of upper and lower molds MA 1 and MB, and before the slider S is lowered, the nozzle 11 is separated from the pair of upper and lower molds MA 2 and MB. be able to. Then, when the nozzle operating unit 20 moves from the forward movement position toward the backward movement position, the nozzle 11 can be moved in a state of being separated from the pair of molds MA and MB more than usual. 11 and a pair of upper and lower molds MA and MB can be reliably prevented.
[0018]
Further, since the ball screw mechanism is employed as the mechanism for moving the nozzle 11, the nozzle 11 can be moved smoothly and accurately. Therefore, as described above, when the nozzle 11 is moved by the ball screw mechanism, the timing at which the nozzle 11 operates and the position where the nozzle 11 is disposed can be accurately controlled each time. Then, since the lubricant can be accurately sprayed to the pair of upper and lower molds MA and MB each time, the fluctuation of the lubricant spray state for each cycle can be suppressed, and the state of lubricant spray can be controlled. Can always keep optimal.
[0019]
The AC servo motor 23 is a rotating means in the claims. However, the rotating means is not limited to the AC servo motor 23, and the screw shaft 21 such as a hydraulic servo motor can be rotated around the axis. If it is a thing, there will be no limitation in particular.
Furthermore, although the screw shaft 21, the nut member 22, and the AC servo motor 23 are the nozzle advancement / retraction part referred to in the claims, the nozzle advancement / retraction part is not limited to the above structure. For example, a hydraulic cylinder having a stroke sensor may be used as the nozzle advance / retreat portion, and the support member 11b may be directly attached to the rod. In other words, the nozzle advancement / retraction portion may employ any mechanism as long as it is a mechanism that moves the nozzle 11 smoothly and accurately along the axial direction thereof.
Furthermore, when a dustproof cover (not shown) is provided around the screw shaft 21, nut member 22, and AC servomotor 23, it is possible to prevent the lubricant from adhering to the screw shaft 21 and the like. It is preferable because the occurrence of a failure of the ball screw mechanism can be suppressed.
[0020]
The slider S of the forging press P is moved by the rotation of a crankshaft (not shown) and stopped at the top dead center every cycle. However, since the inertia force of the crankshaft is large, the slider is accurately stopped at the top dead center. Is difficult, and a displacement from the top dead center occurs at the stop position of the slider S. Therefore, in the nozzle moving mechanism 10 of the present embodiment, by controlling the nozzle operating unit 20 as follows, even if the stop position of the slider S deviates from the top dead center, the lubricant is sprayed onto the molds MA and MB. Adjustments are made so that the condition remains constant.
[0021]
FIG. 3 is a block diagram of the control system. As shown in the figure, the nozzle moving mechanism of the present embodiment is provided with a detection unit 30 including a rotary encoder RE that detects the rotation angle of the crankshaft of the forging press P. The detection unit 30 is based on an angle detection pulse generated by the rotary encoder RE. When the slider S stops, the stop detection unit 31 detects the stop of rotation of the crankshaft, in other words, stops the movement of the slider S. A displacement amount detection unit 32 that detects a displacement amount from the top dead center of the stop position (hereinafter simply referred to as a displacement amount) is provided.
A correction amount calculation unit 33, which is a general computer or the like, is connected to the displacement amount detection unit 32 of the detection unit 30. The correction amount calculation unit 33 has a position of the nozzle 11 when the slider S is stopped, and a relative position from the spray position, that is, the position of the nozzle 11 when the slider S stops at the top dead center. A displacement amount (hereinafter simply referred to as a displacement amount) is calculated based on the displacement amount detected by the displacement amount detection unit 32. The correction amount calculation unit 33 is connected to the AC servomotor 23 and transmits information on the calculated shift amount to the AC servomotor 23 so that the nozzle 11 is directed toward the spray position by the shift amount. The AC servo motor 23 is operated so as to move.
[0022]
For this reason, when the slider S stops near the top dead center, that is, at a position slightly deviated from the top dead center, the stop detection unit 31 detects the stop, and at the same time, the displacement amount detection unit 32 detects the displacement amount. Then, based on this displacement amount, the correction amount calculation unit 33 calculates a displacement amount, operates the AC servo motor 23, and moves the nozzle 11 toward the spraying position by the calculated displacement amount. Therefore, even if the stop position of the slider S varies in each cycle, the position of the nozzle 11 in the axial direction when it is disposed between the pair of molds MA 1 and MB can always be kept constant. Therefore, irrespective of the stop position of the slider S, the state of spraying the lubricant onto the pair of upper and lower molds MA and MB can be kept substantially constant.
[0023]
When the displacement amount of the stop position of the slider S has a certain tendency, the displacement amount detection unit 32 predicts the displacement amount in the next cycle, and the correction amount calculation unit 33 calculates the deviation amount based on the prediction. You may let them. In this case, since it becomes possible to move the nozzle 11 before the slider S stops, the nozzle 11 can be disposed in a short time, and the lubricant spraying operation time can be increased. .
[0024]
Furthermore, the sensor for detecting the displacement amount of the slider S of the forging press P is not limited to the rotary encoder RE, and any sensor may be used.
[0025]
In addition, if the nozzle operating unit 20 of the nozzle moving mechanism 10 as in the present application is employed, the nozzle 11 is a forged product even when the forged forged product sticks to the upper die MA and rises together with the upper die MA. Contact can be prevented. For example, the forging press P is provided with a sensor for detecting an object existing between a pair of upper and lower molds MA and MB. Then, when this sensor detects an object, that is, a forged product that has moved by adhering to the upper die MA, the nozzle 11 separates the AC servo motor 23 of the nozzle operating unit 20 from the pair of upper and lower dies MA 1 and MB. If operated in this way, even if the swing arm 12 swings toward the pair of upper and lower molds MA 1 and MB, contact between the nozzle 11 and the forged product can be prevented.
[0026]
【The invention's effect】
According to the first aspect of the present invention, the nozzle can be moved in the axial direction irrespective of the movement of the slider. Therefore, even if the slider is lowered and the nozzle operating portion starts moving toward the retracted position, the nozzle If the nozzle is moved closer to the mold by the advance / retreat portion, the nozzle can be positioned between the molds. Then, since the time for which the nozzle is positioned between the molds can be lengthened, the spraying time of the lubricant can be made extremely longer than that of a normal device, and more effective lubrication becomes possible. . If the length of the upper mold is long, the nozzle can be moved closer to the mold after the slider is raised and the nozzle is separated from the mold before the slider is lowered. It is possible to reliably prevent the mold from interfering. Further, when the slider stops near the top dead center, the displacement amount between the nozzle stop position and the spray position at that time is based on the slider displacement amount with respect to the top dead center detected by the displacement amount detection unit. Then, the correction amount calculation unit calculates, and the nozzle advance / retreat unit moves the nozzle toward the spray position by the amount of the deviation. For this reason, even if the stop position of the slider at the top dead center varies, the position in the axial direction of the nozzle can always be kept constant when the nozzle is disposed between the pair of molds. Therefore, the state of spraying the lubricant onto the mold can be kept substantially constant regardless of the stop position of the slider.
According to the invention of claim 2, since the nozzle can be moved smoothly and accurately, it is possible to accurately spray the lubricant from the nozzle to the mold. Therefore, it is possible to suppress fluctuations in the spraying state of the lubricant for each cycle, and it is possible to always keep the lubricant spraying state optimal .
[ Brief description of the drawings]
FIG. 1 is an explanatory diagram of a state in which a nozzle operating unit 20 of a nozzle moving mechanism 10 of the present embodiment is disposed at a forward position.
FIG. 2 is an explanatory diagram of a state in which the nozzle operating unit 20 of the nozzle moving mechanism 10 according to the present embodiment is disposed at a retracted position.
FIG. 3 is a block diagram of a control system.
[Explanation of symbols]
10 Nozzle moving mechanism 11 Nozzle 12 Swing arm
12a Support arm
12b Support arm 13 Oscillating member 20 Nozzle operation part 21 Screw shaft 22 Nut member 31 Stop detection part 32 Displacement amount detection part 33 Correction amount calculation part P Forging press S Slider

Claims (2)

In a forging press, a mechanism for inserting and removing a nozzle that blows a lubricant on a pair of upper and lower mold surfaces between a pair of upper and lower molds,
The mechanism
A nozzle actuating part comprising a nozzle , and a nozzle advancing / retreating part for moving the nozzle along its axial direction ;
Coupled to the slider, retracted position advanced position before Symbol nozzle being inserted into spraying position before Symbol nozzle between said pair of upper and lower molds the nozzle actuating portion is detached from between the pair of upper and lower molds a swing arm to move between,
A stop detection unit for detecting the stop of the slider of the forging press;
When the slider stops, a displacement amount detection unit that detects a displacement amount from the top dead center of the stop position;
A correction amount calculation unit that calculates a displacement amount of a relative position between the nozzle stop position and the spray position when the slider is stopped based on the displacement amount detected by the displacement amount detection unit; ,
The nozzle advancing / retreating portion is
The nozzle moving mechanism , wherein the nozzle is moved toward the spray position by the amount of deviation calculated by the correction amount calculation unit . The nozzle advancing / retreating portion is
A screw shaft provided parallel to the axial direction of the nozzle;
A nut member provided so as to be movable along the screw shaft, to which the nozzle is attached;
The nozzle moving mechanism according to claim 1, wherein the nozzle moving mechanism is a ball screw mechanism provided with a rotating means for rotating the screw shaft around its central axis .

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